Showing papers in "Journal of Physics and Chemistry of Solids in 1978"

TL;DR: In this article, the authors measured the high temperature drift mobility of charge carriers in nonstoichiometric cerium dioxide (CeOz_,X) by combining the electrical conductivity and nonstochastic data on the basis of the oxygen vacancy model with correct ionization state.

TL;DR: In this article, the luminescence of β-Ga2O3 crystals and powder specimens has been studied in the temperature range 5-300 K. The measurements have been performed on nominally pure samples and on samples that had been doped with aliovalent cations.

TL;DR: The phase analysis for the system (l−x) CrSi2 + xMnSi2 in the range 0.5 by X-ray technique was carried out in this paper.

TL;DR: In this article, a detailed analysis of X-ray intensities yields all ion locations and interatomic distances in the body centered tetragonal structure (space group I4/MMM).

TL;DR: The self-diffusion of 44 Ti in slightly reduced rutile was measured along the c axis over the temperature range of 1000-1100°C between 0.2 and 1 × 10 −18 atm. oxygen pressure as discussed by the authors.

TL;DR: In this article, the phase diagrams of four ferroelectric ceramics based on lead zirconate (PbZrO 3 ) were determined using dielectric constant and loss measurements.

TL;DR: In this article, the increased hyperfine fields of the 12 k - and 2 b -sites in LaFe 12 O 19 are discussed in terms of the different exchange paths between the iron sublattices.

TL;DR: In this article, electrical conductivity measurements on nickel oxide have been performed at high temperatures (1273 K T K ) and in partial pressures of oxygen ranging from Po 2 = 1.89 × 10 −4 atm to Po 2 : 1 atm.

TL;DR: The thermodynamic parameters of the solution of hydrogen in binary vanadium-chromium alloys (to 20 at.96 at. % Cr) have been determined in this article.

TL;DR: In this paper, a modified Bridgman sylphon method was used to directly measure PVT data of reorientational solids, and it was concluded that the thermodynamic behavior of reoriented crystalline benzene may be described in terms of a cubic crystal equation of state.

TL;DR: The magnetic properties of 2-D antiferromagnetic A CrO 2 (A = Li, Na, K) phases have been investigated by susceptibility measurements as mentioned in this paper, and they have been interpreted on the basis of a Heisenberg Rushbrooke and Wood's model.

TL;DR: In this article, the A1 Raman lines of ferroelectric KH2PO4 (KDP) and KDA (KDA) were measured at various temperatures near Tc.

TL;DR: In this paper, high pressure values for the adiabatic pressure derivative of temperature ( ∂T ∂P ) s have been obtained by measuring the temperature change caused by a small rapid increase in pressure.

TL;DR: In this article, the authors give expressions for electrical conductivity, thermoelectric power and thermal conductivity of conduction band electrons in small-gap zinc-blende semiconductors, obtained by solving the Boltzmann equation by a variational procedure.

TL;DR: In this paper, both experimental and theoretical studies of electron mobility, thermoelectric power, longitudinal Nernst-Ettingshausen effect and Lorentz number in HgSe are presented.

TL;DR: Raman spectra have been obtained for LiNO 3, NaNO 3 and KNO 3 as oriented single crystals and polycrystalline solids over a wide range of temperatures up to the melting points as mentioned in this paper.

TL;DR: In this paper, the first and second pressure derivatives of the elastic moduli of fused quartz have been determined by ultrasonic measurements of the sound velocity as a function of pressure, and the data are used to calculate the equation of state and the volume dependence of the Gruneisen constant.

TL;DR: In this paper, a cumulant approximation in wide use is tested, in the critical region, against a straightforward product-average decomposition approximation, which was used in conjunction with a new integral representation for the Ising model.

TL;DR: In this article, the Fourier transform of the Compton profile is used for the analysis of the electronic structure of crystalline LiH, where there is considerable interaction between the diffuse hydride ions, and new experimental powder data is compared with several recent LCAO models.

TL;DR: In this paper, an interpolation procedure is introduced for obtaining the heat of formation of various halide and oxide compounds, and the energy difference between trivalent and tetravalent rare-earth and actinide metals with non-bonding f-electrons is derived.

TL;DR: In this paper, a thermodynamic model is proposed to determine the laws of variations of n and of Δ H σ, which are correlated with conductivity in the general expression: d ln σ = 1 n d In Po 2 − ΔH σ R d( 1 T ).

TL;DR: In this paper, the contributions of electronic and crystallographic components to the semiconductor → metal transition in VO2 have been estimated from resistivity, E.P.R., and calorimetric measurements of the electronic and thermodynamic properties of GaxV−xO2, where 0 < x < 0.0130.

TL;DR: In this paper, the lattice energy of MgH2 has been calculated using a Born-Mayer model and the result is U0 = −2906.5 kJ mol−1 which may be compared with the Born-Haber cycle value of −2721.3 kJmol−1.

TL;DR: In this article, the authors extended the compressible ion approach to other cubic ionic crystals and derived the lattice spacings and compressibilities of a number of perovskite-like crystals of the form A + B 2+ C 3 −.

TL;DR: In this article, the authors used the piezothermal method to determine the thermal expansivity of benzene up to 4 kbar along 9 isothermal paths, in the range 250-350 K.

TL;DR: In this article, experimental data on the superconducting temperature, and low temperature specific heat, together with X-ray and neutron investigations are reported for two sets of Nb x Sn 1− x, samples with the A15 type structure.

TL;DR: In this article, the galvanomagnetic properties of pyrolytic graphite have been analyzed with particular emphasis on the density of free carriers and its dependence on temperature, since earlier work had shown that experimental results were appreciably different from theoretical predictions.

TL;DR: In this paper, the magnetic properties of single crystals of CuCr2Se4 single crystals were investigated and the magnetic moment at 0 K was found to be 5.07 μB per mole, and the susceptibility at high temperatures follows a Curie-Weiss law with an asymptotic Curie temperature 430 K and a curie constant 2.55 emu · deg mol.

TL;DR: In this article, a study of the temperature dependences reveals that the conductivity occurs by holes in a 3 d -band (Mn 3+ ) and that the mobility of the holes is not thermally activated.